Railway-brake mechanism.



W. l. STAHR. RAILWAY BRAKE NIECHANISM. Arnucmlon -HLEU APR. 2s. mz;

. l |||||||||||cl1 ,a m 2 9 m T W/ mn/M E /HHHHIIIIIIHIlllHllHllllHllllllll l darneg um; man. ummm.. Immun n4 l:A

W` l. STAHR. RAILWAY BRAKE MECHNISM,

APPucATloN man APR. 25, 19u.

1 ,246,672. Patented Nov. 13; 1917.

2 SHEETS-SHEET 2.

um mus, um mnu.. Hummm. n a

, State of WILLIAM J. sTAHE, or NESCOPECK', rrnsnvrsrr.vANIiLRAILWAY-:BRAKE MECHANISM.

Specification of Let-ters Patent.-

Patented Nov. 13, 191 7.

Application filed April 25, 1917. Serial No. 164,530.

To all whom z't may concern.' Be it known that I, lVILLIAM J. STAHR, acitizen of the United States, residing at escopeck, in the county ofLuzerne, and

Pennsylvania, have invented certain new and useful Improvements 1nRailway-Brake 'Mechanism; declare the following to be a full, exactdescription of the invention. such as will enable others skilled in theart to which 1t appertains to make and use the same, reference being hadto the accompanying drawlngs, and to the letters and figures ofreference marked thereon` which form a part of this specification.

This invention relates to new and useful improvements to railway rollingstock and pensating for wear on the brake shoes of brakes by shorteningthe leverage of the brake operating levers.

he invention comprises various details 0f construction` combinations andarrangements of parts which will be hereinafter fullv described, shownin the accompanying drawings and then specifically defined in theappended clai'ins.

I illustrate my invention in the accompanying drawings, in which Figurel is a longitudinal sectional view through a truck with my inventionapplied thereto.

Fig. 2 is a sectional view truck bolster with the plied thereto.

Fig..3 is'a plan view rack bars.

Fig. 4 is a side elevational View of a rack bar.

Fig. 5 is a plan view of the same.

Fig. 6 is a side elevational View of one of the connecting rack bars.

eference now being had to the details of the drawings by numeral, 1indicates the wheels of a truck which comprises the side members 2 heldin spaced relation by the bolster 3, mounted in the usual manner onsprings which in turn are seated m the spring-plank 4.

Guides 3* serve to guide the bolster and which are used in place of thecustomary transoms vwhich ordinarily guide and retain the bolster; in pthrough the present invention apof the connecting 'of y the bar 8Pivotally supported adjacent. the respective ends of the side members 2are the brake shoe supporting members 5 and 5 on .which the brake shoes6 and 6 are mounted and moved into engagement with the respective wheelsb v movement of the members 5 and 5.- l

Secured to opposite sides of the bolster 3 are apertured lugs 6 and 7,the lugs 6 pivotally supporting'the rack bar 8, which is provided withratchet'teeth 9 andv an elongated slot 10, which slot l() coperates withthe lugs l1 formed on the vertical lever l2 and guides the ments. A

spring-pressed pawl 13 is carried by the lever 12 and coacts with teeth9 for holding the lever in its positions of adjustment.

rl`he separable rack bar, comprising arms 13 and 14. has the forked endof the arm 13 thereof pivotally connected to the upper end of the lever12, as at 15. the vokes 16 and 17 extending upwardly therefroln andforming. guides for the arm 11. which is provided with teeth 1S on itsupper surface, coperating with the dog 19, connected to the arm 13. bymeans of pivotal links 21, the dog 19 being also spring-pressed byspring 20' to normally engage the teeth 18.

This arm 1l has its bifurcated-end 22 pivotally connected to the arm 23.which is centrally pivoted as at 24 between the lugs 7, the lower end0f arm 23 having connection with the vertical lever 25 through links 26,the lower end of ,said lever 25 having an anopening of y a brake Shoesupporting member 5. It Will be seen that movement of the lever 25causes a relative movement of the brake shoe 6 carried by the supportingmember 5.

The lower end of the lever l2 is provided with an opening 30 to receivethe central portion 30 of the rod 31, the ends of the rod beingconnected to the brake shoe supporting members 5 to transmit movement tothe shoes 6 thereon. Q

A rod32 extends under the bolster 3 and connects the levers 12 and 25 tohold the same in spaced relation with each other and, at the same time,equalize to a degree the movement of the upper ends of" the levers 12and 25 it being understood that the connecting rod transmits the stressfrom the samein its horizontal move- 12 and that the latter 6 areactuate lever 25 to the lever and its rods 31 and shoes through the rodIn the operation of the device, when the brakes are to be applied, theupper end of lever 25 is moved in the direction of the arrow, due to itsconnection with the air brake apparatus with the result that the arm 1/moves arm 13, through dog 19 and links and it follows that the upper endof lever 1-2 moves in a direction opposite to the direction indicated bythe arrow, the lower end of the lever 12 communicating motion to rods 31and applying the brakes.

It is, of course, obvious that during this 'movement, the pawl 13 movesalong the rack bar 8 and, due to its engagement with teeth 9, preventsmovement of lever 12 with relation to rack bar S on its return movement.lf, after the brakes have been applied, the same have been worn, the arm11 is moved in the direction of the arrow, that is on the movement oflever 25 to its normal position, with the result that the wear on thebrake shoes is taken up through the levers 12 and and the leverageshortened.

1. ln combination with a car truck and the brake shoe supports thereof,a central bolster forming a part of the truck, vertical levers supportedon opposite sides of the bolster, a separable rack bar comprising armsmovable with relation to each other,

means for restricting movement of one arm with relation to the other armwhen Jthe levers are moved in one direction, means for restrictingmovement of the levers in the opposite direction, and means forcommunicating movement of the levers to the brake 4shoe supports.

2. ln combination with a car truck and the brake shoe Supports thereof,acentral bolster forming a part of theJ truck, 'apivoted lever supportedon each side of the'rbolster, a separable rack bar yconnecting the upperends of the levers, said" rack bar comprising slidable arms, one of saidarms having yokes forming guides for the opposite arm, a pivoted dogcarried by one of the arms and cooperating with teeth formed on theadjacent arm for adjusting the arm with relation to each other, meanscarried by one of the levers for holding the arms in such adjustedposition, and means connecting the lower ends of the levers and brakeshoe supports whereby movement of the levers produces a relativemovement thereof."

3. 1n combination with a car truck and the brake shoe supports thereof,a central bolster forming a part of the truck, levers supported onopposite sides separable. rack bar connecting the levers, said separablerack -bar comprising arms slidable with relation to each other, one ofsaid arms having teeth formed on the upper surface thereof, meanscarried by the opposite arm and cooperating with the teeth forpermitting adjustment of the arms with relation to each other, meanscarried by .one of the levers for holding the arms in their 'positionsof adjustment, and means provit ing communication between the lower endsof the levers and brake shoe supports, whereby movement of the leversproduces a relative movement of the supports.

1n testimony whereof l hereunto affix my signature in presence of twowitnesses.

WILLAM J. STAHR.

Vl/'itnesses M. C. Bonn, G. H. Lonwre.

of the bolster, a o

